Elliptic spring.



Patented Aug. 7, |900.`

No. 655,2l0.

' C. l. DUPONT.

ELLIPTIC SPRING.

(Application led 22, 1900A (No Model.)

NVENTOR W/NEssEs 1 Nonms Perses co Mmm. r mom. n. c,

' UNITED STATES,

.PATENT Orr-ion.

CHARLES i. DUPONT, or ,rLAoUEMiNn LOUISIANA.

SPECIFICATION forming part of Letters I atent No. 655,210, dated August7, 1900. Application iled MarohZZ, 1900. Serial Ilo. 9,713. (No model.)

Be it knowntli'at I, CHARLES I. DUPONT, a citizen of the UnitedStates,residing at Plaquemine, in the parish of Iberville and State ofLouisiana, have invented a certain new and useful Elliptic Spring, ofwhich the following is aspeciiication, reference being had therein tothe accompanying drawings.

This invention relates to elliptic springs; and the object in view is toprovide simple and eective means for connecting the eX- tremities of theleaves of an elliptic spring in a manner which will securely couple thesaine together and at the same time prevent any wear from coming uponthe bolts which unite the leaves at their extremities.4 `By re` movingwear from the securing-bolts the life and durability of the spring as awhole are greatly increased. This result is accomplished withoutdetracting in any way from the appearance of the completed spring.

The detailed objects and advantages of the invention will appear inthecourse of the ensuing description.` v

The invention consists in certain novel features and details ofconstruction and arrange-` ment of parts, as hereinafter fullydescribed, illustrated in the drawings, and incorporated in the claimi VIn the accompanying drawings, Figurel is a perspective view of anelliptic springcon` strueted in accordance with the present in vention.Fig. 2 is an enlarged detail vertical longitudinal section through oneend of the spring, taken transversely of one of the end bolts. Fig. 3 isa transverse, section taken through the spring longitudinally of one ofthe bolts, showing the bolt in elevation. Fig.

4 is a detail perspective view of the terminala,

portion of one of the leaves. Fig. 5 is a similar view of the headlessferrule.

Similar numerals of reference are employed to indicate correspondingparts in all the iigures of the drawings.

The spring contemplated in this invention comprises a pair of leaves l,curved reversely to each other, as clearly shown in Fig. 1, and restingin contact with each other Y at the points 2, these contacting-pointsforming rockerbearings for the spring sections or leaves. Beyond thebearing-points 2 the extremities of the leaves are reversely curled orrolled to form half-sleeves 3, which together,

form a split cylindrical sleeve, a space 4 being left between theVextreme `edgesof the half-sleeves, so as to insure the leaves comin gin contact with each otherA at the points 2.

rEmbracing the half-sleeves l3 is a ferrule 5 in the form of a split orincomplete cylinder, the internal diameter of which is approximately thesame or slightly greater than the external diameter of the half-sleeves3, the edges 6 of the ferrule being spaced apart sufficiently to admitthe rocker-bearing portion of the leaves at the points 2. The ferrule 5is ooextensive `in length with the half-sleeves 3, so that thecorresponding edges of the half-sleeves and ferrule lie iiush with eachother. A retaining-bolt 7 passes through the opening formed bythehalf-sleeves 3 and is provided with a head 8 of the same diameter as theferrule 5 and adapted to bear against the adjacent edges of the ferruleand half-sleeves. The bolt is screw-threaded at its opposite end toreceive a nut 9, which may be screwed up against the adjacent edges ofthe half-sleeves and ferrule, or, if preferred, a washer 10, of anysuitable material, may be interposed between the nut 9 and halfsleeves 3and ferrule 5. llrei'erably the nut 9 and washer 10 do not exceed indiameter the diameter of the ferrule 5, thus obviating any projection.

f From the foregoing description it will be 'seen that the terminalportions of the leaves `l lie i n rocking contact with each otherbethereon. 'lhe durability or the spring as a whole is thus materiallyincreased, and at the same time a neat terminal point for the spring isprovided.

Having thus described the invention, what is claimed as new is-f- Anelliptic spring comprising leaves, the

IOC

extremities of whichl are reversely curled.' or y bearingAA against theopen ends of the ferrule rolled to form half-sleeves whielrbearagainstand haulfsleeves5y substantially as? specified. 1o each other at theirpoint of junction with In testimony whereof I ax' mysignat`ure theleaves proper, a. cylindrical and headless in presence of two witnesses.Y

5 split ferrule removably fitted upon the half- CHARLES I. DUPONT.

' sleeves and coextensive therewith, a headed i Witnesses;

bolt passing through the half-sleeves, and aA i I. M. W1LLI'Als'frsl,retaining-nut thereon, the bolt-head and nut l T. E. HUBBARD.

